是否HtmlAgilityPack在其XPATH选择使用正则表达式的能力？ [英] Does HtmlAgilityPack have the ability to use regular expressions in its XPATH selector?

问题描述

我希望能够创建节点的集合，其中的文字用字，然后数字开始。例如，给出以下内容：

 < P> FINDTHIS 1 LT; / P> 
< P> FINDTHIS SOMETEXT< / P> 
将p为H.; FINDTHIS 2'; / P> 
  

我希望能够创建由两个段落节点的集合：FINDTHIS 1和FINDTHIS 2

一种可能的方法是创建一个XPath查询像 // p [开始-与（'FINDTHIS'）] ，然后使用正则表达式来确定下一个字符是否是一个数字。如果我想获得返回的上述标准匹配的列表，我可以创建一个正则表达式对象和测试集合中的每个成员的文本。

有没有使用HtmlAgilityPack？

解决方案<选择器中直接使用正则表达式的方法/ DIV>

没有的 HTML敏捷性包目前不支持这一点。它支持版本的XPath查询1，不支持正则表达式。

这是说，你必须做你建议并选择使用XPath表达式到要使用正则表达式的点，然后使用的 其中，扩展方法筛选出合适的基于一个 正则表达式 实例。

I would like to be able to create a collection of nodes where the text starts with a word and then a number. For example, given the following:

<p>FINDTHIS 1</p>
<p>FINDTHIS SOMETEXT</p>
<p>FINDTHIS 2</p>

I would like to be able to create a collection consisting of two paragraph nodes: FINDTHIS 1 and FINDTHIS 2.

One possible approach would be to create an xpath query like //p[starts-with(., 'FINDTHIS ')] and then use a regular expression to determine whether or not the next character is a number. If I wanted to obtain a list of matches that returned the above criteria, I could create a regular expression object and test the text for each member in the collection.

Is there a way to utilize a regular expression directly within the selector using HtmlAgilityPack?

解决方案

No, the HTML Agility Pack does not currently support this. It supports XPath version 1 queries, which does not support regular expressions.

That said, you'll have to do as you recommended and select using the XPath expression up to the point where you want to use a regular expression, and then use the Where extension method to filter out the appropriate nodes based on an RegEx instance.

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